package com.admin.generator.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.admin.common.constant.Constants;
import com.admin.common.constant.GenConstants;
import com.admin.common.core.text.Convert;
import com.admin.common.exception.BusinessException;
import com.admin.common.utils.StringUtils;
import com.admin.generator.domain.GenTable;
import com.admin.generator.domain.GenTableColumn;
import com.admin.generator.mapper.GenTableColumnMapper;
import com.admin.generator.mapper.GenTableMapper;
import com.admin.generator.service.IGenTableService;
import com.admin.generator.util.GenUtils;
import com.admin.generator.util.VelocityInitializer;
import com.admin.generator.util.VelocityUtils;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 业务 服务层实现
 *
 * @author fangchen
 */
@Service
public class GenTableServiceImpl implements IGenTableService {
    private static final Logger log = LoggerFactory.getLogger( GenTableServiceImpl.class );

    @Autowired
    private GenTableMapper genTableMapper;

    @Autowired
    private GenTableColumnMapper genTableColumnMapper;

    /**
     * 查询业务信息
     *
     * @param id 业务ID
     * @return 业务信息
     */
    @Override
    public GenTable selectGenTableById(Long id) {
        GenTable genTable = genTableMapper.selectGenTableById( id );
        setTableFromOptions( genTable );
        return genTable;
    }

    /**
     * 查询业务列表
     *
     * @param genTable 业务信息
     * @return 业务集合
     */
    @Override
    public List<GenTable> selectGenTableList(GenTable genTable) {
        return genTableMapper.selectGenTableList( genTable );
    }

    /**
     * 查询据库列表
     *
     * @param genTable 业务信息
     * @return 数据库表集合
     */
    public List<GenTable> selectDbTableList(GenTable genTable) {
        return genTableMapper.selectDbTableList( genTable );
    }

    /**
     * 查询据库列表
     *
     * @param tableNames 表名称组
     * @return 数据库表集合
     */
    public List<GenTable> selectDbTableListByNames(String[] tableNames) {
        return genTableMapper.selectDbTableListByNames( tableNames );
    }

    /**
     * 修改业务
     *
     * @param genTable 业务信息
     * @return 结果
     */
    @Override
    @Transactional
    public void updateGenTable(GenTable genTable) {
        String options = JSON.toJSONString( genTable.getParams() );
        genTable.setOptions( options );
        int row = genTableMapper.updateGenTable( genTable );
        if (row > 0) {
            for (GenTableColumn cenTableColumn : genTable.getColumns()) {
                genTableColumnMapper.updateGenTableColumn( cenTableColumn );
            }
        }
    }

    /**
     * 删除业务对象
     *
     * @param ids 需要删除的数据ID
     * @return 结果
     */
    @Override
    @Transactional
    public void deleteGenTableByIds(String ids) {
        genTableMapper.deleteGenTableByIds( Convert.toLongArray( ids ) );
        genTableColumnMapper.deleteGenTableColumnByIds( Convert.toLongArray( ids ) );
    }

    /**
     * 导入表结构
     *
     * @param tableList 导入表列表
     * @param operName  操作人员
     */
    @Override
    @Transactional
    public void importGenTable(List<GenTable> tableList, String operName) {
        for (GenTable table : tableList) {
            try {
                String tableName = table.getTableName();
                GenUtils.initTable( table, operName );
                int row = genTableMapper.insertGenTable( table );
                if (row > 0) {
                    // 保存列信息
                    List<GenTableColumn> genTableColumns = genTableColumnMapper.selectDbTableColumnsByName( tableName );
                    for (GenTableColumn column : genTableColumns) {
                        GenUtils.initColumnField( column, table );
                        genTableColumnMapper.insertGenTableColumn( column );
                    }
                }
            } catch (Exception e) {
                log.error( "表名 " + table.getTableName() + " 导入失败：", e );
            }
        }
    }

    /**
     * 预览代码
     *
     * @param tableId 表编号
     * @return 预览数据列表
     */
    public Map<String, String> previewCode(Long tableId) {
        Map<String, String> dataMap = new LinkedHashMap<>();
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableById( tableId );
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn( table, columns );
        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext( table );

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList( table.getTplCategory() );
        for (String template : templates) {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate( template, Constants.UTF8 );
            tpl.merge( context, sw );
            dataMap.put( template, sw.toString() );
        }
        return dataMap;
    }

    /**
     * 生成代码
     *
     * @param tableName 表名称
     * @return 数据
     */
    @Override
    public byte[] generatorCode(String tableName) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream( outputStream );
        generatorCode( tableName, zip );
        IOUtils.closeQuietly( zip );
        return outputStream.toByteArray();
    }

    /**
     * 批量生成代码
     *
     * @param tableNames 表数组
     * @return 数据
     */
    @Override
    public byte[] generatorCode(String[] tableNames) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream( outputStream );
        for (String tableName : tableNames) {
            generatorCode( tableName, zip );
        }
        IOUtils.closeQuietly( zip );
        return outputStream.toByteArray();
    }

    /**
     * 查询表信息并生成代码
     */
    private void generatorCode(String tableName, ZipOutputStream zip) {
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableByName( tableName );
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn( table, columns );

        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext( table );

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList( table.getTplCategory() );
        for (String template : templates) {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate( template, Constants.UTF8 );
            tpl.merge( context, sw );
            try {
                // 添加到zip
                zip.putNextEntry( new ZipEntry( VelocityUtils.getFileName( template, table ) ) );
                IOUtils.write( sw.toString(), zip, Constants.UTF8 );
                IOUtils.closeQuietly( sw );
                zip.flush();
                zip.closeEntry();
            } catch (IOException e) {
                log.error( "渲染模板失败，表名：" + table.getTableName(), e );
            }
        }
    }

    /**
     * 修改保存参数校验
     *
     * @param genTable 业务信息
     */
    public void validateEdit(GenTable genTable) {
        if (GenConstants.TPL_TREE.equals( genTable.getTplCategory() )) {
            String options = JSON.toJSONString( genTable.getParams() );
            JSONObject paramsObj = JSONObject.parseObject( options );
            if (StringUtils.isEmpty( paramsObj.getString( GenConstants.TREE_CODE ) )) {
                throw new BusinessException( "树编码字段不能为空" );
            } else if (StringUtils.isEmpty( paramsObj.getString( GenConstants.TREE_PARENT_CODE ) )) {
                throw new BusinessException( "树父编码字段不能为空" );
            } else if (StringUtils.isEmpty( paramsObj.getString( GenConstants.TREE_NAME ) )) {
                throw new BusinessException( "树名称字段不能为空" );
            }
        }
    }

    /**
     * 设置主键列信息
     *
     * @param genTable 业务表信息
     * @param columns  业务字段列表
     */
    public void setPkColumn(GenTable table, List<GenTableColumn> columns) {
        for (GenTableColumn column : columns) {
            if (column.isPk()) {
                table.setPkColumn( column );
                break;
            }
        }
        if (StringUtils.isNull( table.getPkColumn() )) {
            table.setPkColumn( columns.get( 0 ) );
        }
    }

    /**
     * 设置代码生成其他选项值
     *
     * @param genTable 设置后的生成对象
     */
    public void setTableFromOptions(GenTable genTable) {
        JSONObject paramsObj = JSONObject.parseObject( genTable.getOptions() );
        if (StringUtils.isNotNull( paramsObj )) {
            String treeCode = paramsObj.getString( GenConstants.TREE_CODE );
            String treeParentCode = paramsObj.getString( GenConstants.TREE_PARENT_CODE );
            String treeName = paramsObj.getString( GenConstants.TREE_NAME );
            genTable.setTreeCode( treeCode );
            genTable.setTreeParentCode( treeParentCode );
            genTable.setTreeName( treeName );
        }
    }
}